JACQUES LOEB 



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pH 



17 IS ZO Z2 2.4 2.6 Z8 3.0 



Fig. 5. 



can hence be used as a measure of the concentration of the ionized 

 gelatin in the solution. Fig. 4 shows that the curve for the conduc- 

 tivity of gelatin chloride rises continually with increasing hydrogen 

 ion concentration. Fig. 5 is a completion of Fig. 4 for pH down to 

 2.0. (The ordinates are on a smaller scale in Fig. 5 than in Fig. 4.) 

 It is obvious that at no time does the conductivity curve for gelatin 

 chloride, i.e. the curve representing the concentration of ionized pro- 

 tein, show the drop observed in the curves representing the other 

 properties of proteins. 



